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Spectral and Energy Efficiency of Downlink MU-MIMO Systems with MRT

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China Communications 2017年第5期14卷 105-111页

作者： weiqiang tan Shi Jin Jide Yuan National Communications Research Laboratory Southeast UniversityNanjing 210096China

This paper studies the achievable spectral efficiency(SE)of downlink multiuser multiple-input-multiple-output(MIMO)system,where the base station(BS)is deployed an arbitrary finite antenna number and communicates simultaneously with many users. We assume that the BS has accurate channel state information(CSI)and adopt maximum ratio transmission(MRT)precoding. An accurate analytical result for the achievable SE is obtained. Based on the analytical result on the achievable SE,we further study the achievable energy efficiency(EE)of multiuser MIMO system by considering an energy consumption model. Results indicate that the increasing number of BS antennas can boost the achievable SE of system,whilst the achievable SE tends to a saturated rate in the high signal-tonoise ratios(SNR)regime. Furthermore,an important conclusion is that the increasing number of users is beneficial for the achievable EE and there is an optimal antenna number to maximize the EE of system.

关键词： energy efficiency multiuser MIMO maximum ration transmission spectral efficiency

Performance Analysis of Intelligent Reflecting Surface Assisted Wireless Communication System

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 775-787页

作者： weiqiang tan Quanquan Zhou Weijie tan Longcheng Yang Chunguo Li School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou510006China Key Laboratory of Advanced Manufacturing Technology Ministry of EducationGuizhou UniversityGuiyang550025China Sichuan Key Laboratory of Indoor Space Layout Optimization and Security Guarantee Chengdu Normal UniversityChengdu611130China School of Information Science and Engineering Southeast UniversityNanjing210096China

In this paper,we investigate the end-to-end performance of intelligent reflecting surface(IRS)-assisted wireless communication *** consider a system in which an IRS is deployed on a uniform planar array(UPA)configuration,including a large number of reflecting elements,where the transmitters and receivers are only equipped with a single *** objective is to analytically obtain the achievable ergodic rate,outage probability,and bit error rate(BER)of the ***,to maximize the system’s signal-to-noise ratio(SNR),we design the phase shift of each reflecting element and derive the optimal reflection phase of the IRS based on the channel state information(CSI).We also derive the exact expression of the SNR probability density function(p.d.f.)and show that it follows a non-central Chi-square *** the p.d.f.,we then derive the theoretical results of the achievable rate,outage probability,and *** accuracy of the obtained theoretical results is also verified through numerical *** shown that the achievable rate,outage probability,and BER could be improved by increasing the number of reflecting elements and choosing an appropriate SNR ***,we also find that the IRS-assisted communication system achieves better performance than the existing end-to-end wireless communication.

关键词： Massive MIMO intelligent reflecting surface uniform planar array achievable ergodic rate

Spectral Efficiency and Power Allocation for Mixed-ADC Massive MIMO System

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China Communications 2018年第3期15卷 112-127页

作者： Mengjiao Zhang weiqiang tan Junhui Gao Shi Jin National Mobile Communications Research Laboratory Southeast University School of Computer Science and Educational Software Guangzhou University

This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are equipped with full-resolution ADCs while others are deployed with low-resolution ADCs. We derive the theoretical results and corresponding approximate expressions of the achievable SE in multi-cell systems with maximum ratio combining(MRC) detector and in single-cell systems with zero-forcing(ZF) detector. Based on approximated results, the effects of physical parameters, including the transmit power, the number of antennas, the proportion of full-resolution ADCs and the quantization precision of the low-resolution ADCs on the achievable SE are revealed. Furthermore, we propose the power allocation algorithms based on the lower bound and upper bound of approximate achievable SE. Our results show that the total achievable SE improves by increasing the number of BS antennas, the signal-to-noise ratio(SNR), and the quantization precision. Results showcase that proposed power allocation algorithms remarkably improve the total achievable SE comparing to the equal power allocation algorithm, which verifies the effectiveness of our proposed schemes.

关键词： massive MIMO mixed-ADC ar-chitecture MRC detector ZF detector spec-tral efficiency power allocation scheme.

Cooperative Rate Splitting Transmit Design for Full-Duplex-Enabled Multiple Multicast Communication Systems

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Computer Modeling in Engineering & Sciences 2024年第1期138卷 619-638页

作者： Siyi Duan Mingsheng Wei Shidang Li weiqiang tan Bencheng Yu School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou221116China School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou510006China School of Information Engineering Xuzhou Vocational College of Industrial TechnologyXuzhou221140China

This paper examines the performance of Full-Duplex Cooperative Rate Splitting(FD-CRS)with Simultaneous Wireless Information and Power Transfer(SWIPT)support in Multiple Input Single Output(MISO)*** a Rate Splitting Multiple Access(RSMA)multicast system with two local users and one remote user,the common data stream contains the needs of all users,and all users can decode the common data ***,each user can receive some information that other users need,and local users with better channel conditions can use this information to further enhance the reception reliability and data rate of users with poor channel *** using Cell-Center-Users(CCUs)as a cooperative relay to assist the transmission of common data can improve the average system *** maximize the minimum achievable rate,we optimize the beamforming vector of Base Station(BS),the common streamsplitting vector,the cooperative distributed beamvector and the strong user transmission power under the power budget constraints of BS and relay devices and the service quality requirements constraints of *** the whole problem is not convex,we cannot solve it ***,we propose a low complexity algorithm based on Successive Convex Approximation(SCA)technology to find the optimal solution to the problemunder *** simulation results show that FD C-RSMA has better gain andmore powerful than FD C-NOMA,HD C-RSMA,RSMA and NOMA.

关键词： Full-duplex cooperative rate segmentation SWIPT RSMA power control

The short wave near-infrared fluorescence properties of two p-azaquinodimethane (p-AQM)-based conjugated polymers

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Journal of Innovative Optical Health Sciences 2020年第5期3卷 96-104页

作者： Yaowei Zhu Yawei Miao Tingting Xue Youchang Liu Chunying Zheng Jiping Ma weiqiang tan Shuguang Wen Chuantao Gu School of Environmental and Municipal Engineering Qingdao University of Technology Qingdao 266580 P.R.China CAS Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P.R.China China United Test e Evaluation(Qingdao)Co. Ltd.Qingdao 266011P.R.China Qingdao Institute of Textile Fibre Supervision and Inspection Qingdao 266061P.R.China

The absorption,scattering,and autofluorescence of biological tissues in short-wave infrared re-gion(SWIR,900-1700 nm)are relatively low,so SWIR fluorescence usually has deeper pene-tration into living tissues,and can show a higher signal-to-noise ratio when used for imaging in ***,there are few types of organic SWIR fluorescent materials *** this work,p-azaquinodimethane(p-AQM)with a quinoid structure is used as the acceptor unit,and car-bazole or fluorene with sp3 hybridization are used as the donor units,two conjugated polymers were *** quinone structure is conducive to the redshift of absorption and fluores-cence spectra,and the sp3 hybridization structure is conducive to weakening the aggregation quenching of polymer *** and PCz exhibited absorption peaks of 492 nm and 508 nm,*** emission peaks of the two polymers are 920 nm and 950 nm,respec-tively,both in the short-wave near infrared *** quantum yield(QY)of PF and PCz is 0.4%and 0.3%,respectively.

关键词： Short-wave infrared region fluorescence p-azaquinodimethane conjugated polymers

On the Consistency of Option Pricing Model with a General Equilibrium Framework

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Journal of Systems Science and Information 2007年第1期5卷 71-80页

作者： Ying Chen weiqiang tan School of Business Sun Yat-sen University Guangzhou 510275 China Institute of BehavioralFinance and Financial Economics Sun Yat-sen University Guangzhou 510275 China

There are two methods on option pricing, no-arbitrage and equilibrium analysis. We construct a simple economy with continuous consumption, in which we “endogenize” the stochastic process of prices in the option pricing model based on no-arbitrage analysis. With constant relative risk aversion type utility function assumption, we present Merton （1973） option pricing model and find the consistency of the model with a general equilibrium framework. We extend the model to the market with m securities and it turns out similar results.

关键词： option pricing general equilibrium analysis no-arbitrage analysis

Recent Development in Thrombin Receptor Antagonist as Novel Antithrombotic Agent

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Open Journal of Medicinal Chemistry 2012年第4期2卷 112-118页

作者： Huan Cui weiqiang tan Jianshuo Shi Yan Xia School of Environmental and Municipal Engineering Qingdao Technological University Qingdao China.

Significant progress was achieved in the search of a thrombin receptor antagonist as a novel antithrombotic treatment since the thrombin receptor (protease-activated receptor-1, PAR-1) was cloned 20 years ago. Previous works have shown that it is possible to develop potent thrombin receptor antagonists to compete effectively with the receptor’s internal “tethered” ligand to block platelet activation. Vorapaxar (SCH 530348) from Schering-Plough (now Merck) and atopaxar (E5555) from Eisai have been advanced to human clinical trials. Recently, the pivotal phase III clinical trial results for vorapaxar were published. In this article we review these results plus the phase II results from atopaxar. Several newly described thrombin receptor antagonists from the literature will also be discussed. The phase III results from vorapaxar demonstrated that a thrombin receptor antagonist can achieve efficacy in addition to current standard- of-care in treating atherothrombotic patients, especially those with previous myocardial infarction (MI). However, the increased moderate and severe bleeding, especially intracranial bleeding, point to the limitations of current thrombin receptor antagonists. Future thrombin receptor antagonists that can improve on the efficacy and bleeding profile of current ones should have a promising place in meeting the unmet medical need in treating atherothrombotic patients using current standard therapy.

关键词： Thrombin Receptor Antagonist PAR-1 Antagonist Vorapaxar Antithrombotic Review

Programmed 6-Step Approach of Improved Liposuction-Curettage for Axillary Bromhidrosis

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Chinese Journal of Plastic and Reconstructive Surgery 2020年第3期2卷 142-148,160页

作者： Yanqi LIU Yanmeng PAN Minxia ZHANG Li CHEN Fawei XU Hongfang MA Xing HE Ying HU Guijuan HE Jiaqin CAI weiqiang tan Department of Plastic Surgery Sir Run Run Shaw HospitalZhejiang University School of Medicine3 East Qingchun RoadHangzhou 310016Zhejiang ProvincePeople’s Republic of China Department of Plastic Surgery Fourth Affiliated HospitalZhejiang University School of MedicineN1 Shangcheng RoadYiwuZhejiang 322000China

Background Liposuction-curettage is a long-standing and effective treatment for axillary ***,residual malodor and skin necrosis typically occur following this ***,we improved this method to ensure fewer complications and better ***,we have presented our programmed 6-step approach of improved *** The programmed 6-step approach of improved liposuction-curettage was used to remove the axillary apocrine *** used pointed and obtuse cannulas designed for *** Patients treated using the programmed 6-step approach of improved liposuctioncurettage did not experience any serious complications or residual *** The programmed 6-step approach of improved liposuction-curettage was more effective than traditional surgery with respect to the treatment of axillary bromhidrosis.

关键词： Axillary bromhidrosis Liposuction-curettage Programmed 6-step approach

Low-Cost Massive MIMO:Pilot Length and ADC Resolution

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Journal of Communications and Information Networks 2018年第2期3卷 14-27页

作者： Dan Qiao Xi Yang weiqiang tan Chaokai Wen Shi Jin National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China School of Computer Science and Educational Software Guangzhou UniversityGuangzhou 510006China Institute of Communications Engineering Sun Yat-sen UniversityKaohsiung 80424TaiwanChina

When designing an energy efficient massive multiple-input multiple-output(MIMO)system where each receiver antenna is equipped with a low-resolution analog-to-digital converter(ADC),the number of base station(BS)antennas and quantization bits are generally two mutually conflicting system *** this paper,we investigate the joint optimization of the number of BS antennas and ADC resolution in quantized massive MIMO systems,assuming imperfect channel state infor-mation(CSI).A tractable approximate expression for the uplink sum spectral efficiency(SE)using maximal ratio combining(MRC)receivers is derived,based on which the pilot length which maximizes the sum SE is put *** the effect of ADCs,a realistic model of total power consumption is given *** on it,we formulate the optimization problem of selecting the number of BS antennas and ADC resolution to maximize the sum SE under a total power consumption *** results show that more pilot symbols should be assigned for massive MIMO systems with low-resolution ADCs,especially for the receivers with one-bit ***,the results show the trade-off between the number of BS antennas and quantization ***-ical results suggest that there exists an optimal ADC resolution in massive MIMO systems,while lower quan-tization bits may cause a substantial degradation of the SE performance and higher one will consume more power.

关键词： massive MIMO quantization imperfect CSI pilot length spectral efficiency power consumption